How familiar are you with homebrew?
Nintendont is a wii (or vwii in your case, since you have a wiiu) .dol file. It runs on itself and uses IOS56 (so no extra cIOS required). AFAIK, it doesn't modify the nand even the slightest bit. As such, the risks of things going wrong are close to none (at worst, it crashes so you'll have to manually restart your console...but it's so heavily tested and updated the last crash was probably months ago).
If some of those terms don't make sense to you (vwii, dol, IOS, cIOS, nand,...) ...do look them up before installing. It's a bit of a learning curve, but it's essential.
If you literally have no idea what nintendont tries to do...then simply don't use it. You won't need it for simply playing wiiu or wii games.